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	\path (0,8.667) node[above] {$z$}
	                   (7.746,-1.886) node[right] {$x$}
	                   (7.23,3.96) node[right] {$y$};
	\path (6.197,-1.508) node[below, yshift=-1mm] {$b_1$}
	                 (0,6.933) node[above, xshift=3mm, yshift=3mm] {$b_4$}
	                 (6.197,5.425) node[above, yshift=3mm] {$b_5$};
	\path (0,0) node[left, xshift=-1mm,yshift=0.5mm] {$a_2, b_0$}
	                   (3.098,-.754) node[right,xshift=1mm, yshift=1mm] {$a_3$}
	                   (3.098,2.712) node[right, xshift=1mm] {$a_7$}
	                   (0,3.467) node[right,xshift=1mm,yshift=1mm] {$a_6$};
	\draw [->,shorten <=1pt,>=stealth',semithick,red] (0,3.467) to [bend left=45] (0,6.933);
	\draw [->,shorten <=1pt,>=stealth',semithick,red] (3.098,2.712) to (6.197,5.425);
	\draw [->,shorten <=1pt,>=stealth',semithick,red] (3.098,-.754) to [bend right=45] (6.197,-1.508);
	\end{tikzpicture}%%
\end{preview}
\end{document}
%\end{center}
%\vspace*{\fill}
%\end{document}
% End sketch output
